Pico C weather API consumer

pico.c

// This programm calls the aerisapi.com weather web service.
// The return value is a JSON string. Since PicoC does not support
// JSON I use scraping of the string to find the values.

enum OutputPorts
{
    Temperature,        // AQ1
    Humidity,            // AQ2
    windKPH,             // AQ3
    Precip1HR,
    UV
};

int GetIntValue(char *name, int def)
{
    int value = def;

    int pos = strfind(result, name, 0);

    if(pos > 0)
    {
        char *stemp = calloc(1, 10);
        int lenName = strlen(name);

        strncpy(stemp, result + pos + lenName, 5);

        value = atoi(stemp);

        setoutput(Temperature, temp);

        free(stemp);
        stemp = 0;
    }

    printf ("%s = %d", name, value);

    return value;
}

/// <Summary>
/// Main loop.
/// </Summary>
while(TRUE)
{
    char *host = "www.wunderground.com";
    char *page = "/api/Your_Key/conditions/q/CA/San_Francisco.json";

    char *result = httpget(host, page);

    if(result != 0)
    {
        int temp = GetIntValue("\"temp_c\":", -100);  // a -100 az alapertelmezett ertek (gondolom)

        if(temp != -100)  // ha nem az alapertelmezett ertek akkor beallitjuk az eredmenyben
        {
            setoutput(Temperature, temp);
        }

        int humidity = GetIntValue("\"relative_humidity\":", -100);

        if(humidity != -100)
        {
            setoutput(Humidity, humidity);
        }

        int wind = GetIntValue("\"wind_kph\":", -100);

        if(wind != -100)
        {
            setoutput(windKPH, wind);
        }
        
        int precip = GetIntValue("\"precip_1h_metric\":", -100);

        if(precip != -100)
        {
            setoutput(Precip, precip);
        }
        
        int uv = GetIntValue("\"UV\":", -100);

        if(uv != -100)
        {
            setoutput(Precip, precip);
        }

        free(result);
    }

    // Slow the loop down 10 minutes
    int sleepTime = 10 * 60 * 1000;
    sleep(sleepTime);
}

San_Francisco.json

{
  "response": {
  "version": "0.1",
  "termsofService": "http://www.wunderground.com/weather/api/d/terms.html",
  "features": {
  "conditions": 1
  }
  },
  "current_observation": {
  "image": {
  "url": "http://icons-ak.wxug.com/graphics/wu2/logo_130x80.png",
  "title": "Weather Underground",
  "link": "http://www.wunderground.com"
  },
  "display_location": {
  "full": "San Francisco, CA",
  "city": "San Francisco",
  "state": "CA",
  "state_name": "California",
  "country": "US",
  "country_iso3166": "US",
  "zip": "94101",
  "latitude": "37.77500916",
  "longitude": "-122.41825867",
  "elevation": "47.00000000"
  },
  "observation_location": {
  "full": "SOMA - Near Van Ness, San Francisco, California",
  "city": "SOMA - Near Van Ness, San Francisco",
  "state": "California",
  "country": "US",
  "country_iso3166": "US",
  "latitude": "37.773285",
  "longitude": "-122.417725",
  "elevation": "49 ft"
  },
  "estimated": {},
  "station_id": "KCASANFR58",
  "observation_time": "Last Updated on June 27, 5:27 PM PDT",
  "observation_time_rfc822": "Wed, 27 Jun 2012 17:27:13 -0700",
  "observation_epoch": "1340843233",
  "local_time_rfc822": "Wed, 27 Jun 2012 17:27:14 -0700",
  "local_epoch": "1340843234",
  "local_tz_short": "PDT",
  "local_tz_long": "America/Los_Angeles",
  "local_tz_offset": "-0700",
  "weather": "Partly Cloudy",
  "temperature_string": "66.3 F (19.1 C)",
  "temp_f": 66.3,
  "temp_c": 19.1,
  "relative_humidity": "65%",
  "wind_string": "From the NNW at 22.0 MPH Gusting to 28.0 MPH",
  "wind_dir": "NNW",
  "wind_degrees": 346,
  "wind_mph": 22.0,
  "wind_gust_mph": "28.0",
  "wind_kph": 35.4,
  "wind_gust_kph": "45.1",
  "pressure_mb": "1013",
  "pressure_in": "29.93",
  "pressure_trend": "+",
  "dewpoint_string": "54 F (12 C)",
  "dewpoint_f": 54,
  "dewpoint_c": 12,
  "heat_index_string": "NA",
  "heat_index_f": "NA",
  "heat_index_c": "NA",
  "windchill_string": "NA",
  "windchill_f": "NA",
  "windchill_c": "NA",
  "feelslike_string": "66.3 F (19.1 C)",
  "feelslike_f": "66.3",
  "feelslike_c": "19.1",
  "visibility_mi": "10.0",
  "visibility_km": "16.1",
  "solarradiation": "",
  "UV": "5",
  "precip_1hr_string": "0.00 in ( 0 mm)",
  "precip_1hr_in": "0.00",
  "precip_1hr_metric": " 0",
  "precip_today_string": "0.00 in (0 mm)",
  "precip_today_in": "0.00",
  "precip_today_metric": "0",
  "icon": "partlycloudy",
  "icon_url": "http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
  "forecast_url": "http://www.wunderground.com/US/CA/San_Francisco.html",
  "history_url": "http://www.wunderground.com/history/airport/KCASANFR58/2012/6/27/DailyHistory.html",
  "ob_url": "http://www.wunderground.com/cgi-bin/findweather/getForecast?query=37.773285,-122.417725"
  }
}